<template>
  <div class="app-container">
    <h2 style="text-align: center">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px">
      <el-step title="填写课程基本信息" />
      <el-step title="创建课程大纲" />
      <el-step title="提交审核" />
    </el-steps>

    <el-button type="text" @click="openSaveOrUpdateChapterDialog()">添加章节</el-button>

    <!-- 章节 -->
    <ul class="chanpterList">
        <li v-for="chapter in chapterVideoList" :key="chapter.id">
            <p>
                {{ chapter.title }}

                <span class="acts">
                    <el-button style="" type="text" @click="openSaveOrUpdateVideoDialog(chapter.id)">添加小节</el-button>
                    <el-button style="" type="text" @click="openSaveOrUpdateChapterDialog(chapter.id)">编辑</el-button>
                    <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                </span>
            </p>

            <!-- 视频 -->
            <ul class="chanpterList videoList">
                <li v-for="video in chapter.videoList" :key="video.id">
                  <p>
                    {{ video.title }}
                    <span class="acts">
                        <el-button type="text" @click="openSaveOrUpdateVideoDialog(video.chapterId, video.id)">编辑</el-button>
                        <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                    </span>
                  </p>
                </li>
            </ul>
        </li>
    </ul>

    <el-form label-width="120px">
      <el-form-item>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </el-form-item>
    </el-form>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
        <el-form :model="chapter" label-width="120px">
            <el-form-item label="章节标题">
                <el-input v-model="chapter.title"/>
            </el-form-item>
            <el-form-item label="章节排序">
                <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
            </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
            <el-button @click="dialogChapterFormVisible=false">取 消</el-button>
            <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
        </div>
    </el-dialog>

    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加小节">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.isFree">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">收费</el-radio>
          </el-radio-group>
        </el-form-item>

        <el-form-item label="上传视频">
            <el-upload
                :on-success="handleVodUploadSuccess"
                :on-remove="handleVodRemove"
                :before-remove="beforeVodRemove"
                :on-exceed="handleUploadExceed"
                :file-list="fileList"
                :action="BASE_API + '/servicevod/vod/uploadAlyiVideo'"
                :limit="1"
                class="upload-demo">
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
                <div slot="content">最大支持1G，<br>
                    支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                    GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                    MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                    SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
                <i class="el-icon-question"/>
            </el-tooltip>
          </el-upload>
        </el-form-item> 

      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>

  </div>
</template>
<script>
import chapterApi from "@/api/edu/chapter";
import videoApi from "@/api/edu/video";

export default {
  data() {
    return {
      BASE_API: process.env.BASE_API, // 接口API地址
      saveBtnDisabled: false,
      saveVideoBtnDisabled: false,
      chapterVideoList: [],
      chapter: { //封装章节数据
        title: '',
        sort: 0
      },
      video: {
        id: '',
        chapterId: '',
        title: '',
        sort: 0,
        isFree: true,
        videoSourceId: '',
        videoOriginalName:''// 视频名称
      },
      fileList: [],// 上传文件列表 
      dialogChapterFormVisible: false,// 章节弹框
      dialogVideoFormVisible: false // 小节弹框
    };
  },

  created() {
    // 获取路由的id值
    if (this.$route.params && this.$route.params.id) {
      this.courseId = this.$route.params.id;
      // 根据课程id查询章节和小节
      this.getChapterVideoList();
    }
  },

  methods: {
    previous() {
      this.$router.push({ path: "/edu/course/info/" + this.courseId });
    },
    next() {
      this.$router.push({ path: "/edu/course/publish/" + this.courseId });
    },
    // 获取列表
    getChapterVideoList() {
      chapterApi.getChapterVideoList(this.courseId).then(response => {
        this.chapterVideoList = response.data.list;
      })
    },
    // 弹出添加章节页面
    openSaveOrUpdateChapterDialog(chapterId) {
      if (chapterId) {
        //调用接口
        chapterApi.getChapter(chapterId).then(response => {
          this.chapter = response.data.chapter;
        });
      } else {
        // 表单数据清空
        this.chapter.title = '';
        this.chapter.sort = 0;
      }
      // 弹框
      this.dialogChapterFormVisible = true;
    },
    saveOrUpdate() {
      this.chapter.id ? this.updateChapter() : this.addChapter();
    },
    addChapter() {
      // 设置课程id到chapter对象里面
      this.chapter.courseId = this.courseId;
      chapterApi.addChapter(this.chapter).then(response => {
        //关闭弹框
        this.dialogChapterFormVisible = false;
        this.$message({
          type: 'success',
          message: response.message
        });
        this.getChapterVideoList();
      });
    },
    updateChapter() {
      chapterApi.updateChapter(this.chapter).then(response => {
        //关闭弹框
        this.dialogChapterFormVisible = false;
        this.$message({
          type: 'success',
          message: response.message
        });
        this.getChapterVideoList();
      });
    },
    removeChapter(chapterId) {
      this.$confirm('此操作将删除章节, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => { 
        chapterApi.deleteChapter(chapterId).then(response => {
          // 提示信息
          this.$message({
            type: 'success',
            message: response.message
          });
          // 刷新页面
          this.getChapterVideoList();
        });
      })
    },
    //删除小节
    removeVideo(id) {
      this.$confirm('此操作将删除小节, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
      }).then(() => {  // 点击确定，执行then方法
          // 调用删除的方法
          video.deleteVideo(id).then(response => {// 删除成功
            // 提示信息
            this.$message({
                type: 'success',
                message: response.message
            });
            // 刷新页面
            this.getChapterVideoList();
          });
      }) //点击取消，执行catch方法
    },
    // 添加/修改小节弹框的方法
    openSaveOrUpdateVideoDialog(chapterId, videoId) {
      if (videoId) {
        videoApi.getVideoById(videoId).then(response => {
          this.video = response.data.video;
        })
      } else {
        // 设置章节id
        this.video.chapterId = chapterId;
        this.video.id = '';
        this.video.title = '';
        this.video.sort = 0;
        this.video.free =  0;
        this.video.videoSourceId = '';
        this.video.videoOriginalName = '';//视频名称
        this.fileList = [];
      }
      // 弹框
      this.dialogVideoFormVisible = true;
    },
    saveOrUpdateVideo() {
      if(!this.video.videoSourceId){
        this.$message('视频正在上传中...');
        return;
      }
      this.video.id ? this.updateVideo() : this.addVideo();
    },
    // 添加小节
    addVideo() {
      // 设置课程id
      this.video.courseId = this.courseId;
      videoApi.addVideo(this.video).then(response => {
        // 关闭弹框
        this.dialogVideoFormVisible = false;
        // 提示
        this.$message({
            type: 'success',
            message: response.message
        });
        // 刷新页面
        this.getChapterVideoList();
      })
    },
    // 修改小节
    updateVideo() {
      videoApi.updateVideo(this.video).then(response => {
        // 关闭弹框
        this.dialogVideoFormVisible = false;
        // 提示
        this.$message({
            type: 'success',
            message: response.message
        });
        // 刷新页面
        this.getChapterVideoList();
      });
    },
    // 删除小节
    removeVideo(id) {
      this.$confirm('此操作将删除小节, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {  //点击确定，执行then方法
        videoApi.deleteVideo(id).then(response => {
          // 关闭弹框
          this.dialogVideoFormVisible = false;
          // 提示
          this.$message({
              type: 'success',
              message: response.message
          });
          // 刷新页面
          this.getChapterVideoList();
        });
      }); 
    },
    // 上传视频成功调用的方法
    handleVodUploadSuccess(response, file, fileList) {
        //上传视频id赋值
        this.video.videoSourceId = response.data.videoId;
        //上传视频名称赋值
        this.video.videoOriginalName = file.name;
    },
    handleVodRemove() {
      //调用接口的删除视频的方法
      videoApi.deleteAliyunvod(this.video.videoSourceId).then(response => {
        // 提示信息
        this.$message({
            type: 'success',
            message: '删除视频成功!'
        });
        // 把文件列表清空
        this.fileList = [];
        // 把video视频id和视频名称值清空
        // 上传视频id赋值
        this.video.videoSourceId = '';
        // 上传视频名称赋值
        this.video.videoOriginalName = '';
      })
    },
    handleUploadExceed() {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频');
    },
    beforeVodRemove(file,fileList) {
      return this.$confirm(`确定移除 ${ file.name }？`);
    }
  },
};
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
    z-index: 1;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;

}
.chanpterList .acts {
    float: right;
    font-size: 14px;
      
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}
</style>